I just got a 3x4 pre-A Speed and along with it in the box was a King Sol flash gun. The lens on the camera was a ZJ 135/4.5 Tessar in a Dial-Set Compur shutter.

I'd like to be able to connect the flash gun to the shutter, via a solenoid. The problem is that I have no idea which plug to use on the flash gun and I don't know if there is a solenoid that will work on this camera with this shutter.

Anyone have any suggestions about where I could start getting parts for this project?

King Sol was a late commer to the table of flash guns, out right copying the Heiland. I know Mendelsohn made a solenoid for the Dial Compur in the early days. They even had an extra little finger to interfere with the shutter cocking lever so you could leave the lens open.

The hard way to solve the problem would be to search and research what kind of linkage a Dial Compur and a Heiland used. Then go find it.

The easier way (at least on the surface) would be to find a solenoid that screwed into the cable release hole. Both King Sol and Heiland made them and they are in effect a typical solenoid with a tapered thread on the head. Once you locate that, the rest is easy.

You might want to pick up a copy of "Synchroflash Photography by Morgan and Lester. It's of the time period of the Pre Ann and if nothing else, a fun read.

My first Anny. Speed had a dial-set Compur fitted with a SOL solanoid. As I recall, the linkage to the shutter release could be easily disconnected to allow B and T. Let me check my files and see if I still have the scans I took when I sold the camara.
If you go to http://www.datelinelondon.de/ and check the files you will find a PDF version on the King Sol installation guide/product listing.
I do in fact still have the scans on this harddrive. PM your e-mail and I'll send them, since I'm too dumb to figure out how to post a scan here.
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It actually appears as if I have the hardware on the front of the lensboard to mount the solenoid, as well as the "finger" Les mentioned which holds the shutter open during a snap exposure. The only thing I'm missing is the solenoid itself.